公开(公告)号：US20240406051A1

公开(公告)日：2024-12-05

申请号：US18688368

申请日：2021-09-03

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Hayato FUKUZONO ,  Keita KURIYAMA ,  Masafumi YOSHIOKA ,  Toshifumi MIYAGI

IPC: H04L27/34

Abstract: A system including a plurality of base stations and terminal stations. A base station includes a transmission signal amplifier enabled to vary transmission power, provides a specification regarding an input-output characteristic of the transmission signal amplifier to a terminal station, and provides transmission power to the terminal station. The terminal station estimates a constellation of a signal points on the basis of the transmission power and the specification, detects a coordinate point on constellation coordinates, of a reception signal, and detects interference power received from base stations and that are not communication partners. Further, a reception point is calculated in which an influence of the interference power is reflected on the coordinate point, and a likelihood with the signal points is calculated for the reception point. Then, a symbol intended by the reception signal is specified on the basis of a calculation result of the likelihood.

公开(公告)号：US20240356787A1

公开(公告)日：2024-10-24

申请号：US18686892

申请日：2021-08-27

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Keita KURIYAMA ,  Hayato FUKUZONO ,  Masafumi YOSHIOKA ,  Toshifumi MIYAGI

IPC: H04L25/03 ,  H04B7/0456

CPC classification number: H04L25/03343 ,  H04B7/0456 ,  H04L2025/03585

Abstract: A wireless communication method according to an embodiment includes precoding a stream of a transmission signal in a time domain by using an FIR filter, controlling a transmission power of the precoded stream, amplifying the precoded stream such that the controlled transmission power is obtained; and performing control for changing a tap length in precoding such that the tap length is decreased in a case where a magnitude of a last tap coefficient in precoding is small and the tap length is increased in a case where the magnitude is large, with respect to a threshold value calculated on the basis of quality information of a received signal fed back from a reception device that has received the amplified stream or quality information of a received signal calculated by using at least characteristics of an amplifier.

公开(公告)号：US20240072847A1

公开(公告)日：2024-02-29

申请号：US18260483

申请日：2021-01-07

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Hayato FUKUZONO ,  Keita KURIYAMA ,  Masafumi YOSHIOKA ,  Toshifumi MIYAGI

IPC: H04B7/022 ,  H04B7/0408

CPC classification number: H04B7/022 ,  H04B7/0408

Abstract: An aggregation station: receives, from each of the base stations, communication path information with each of accommodated user terminals, for each user terminal; in a case where it is determined that the two of the base stations and the two user terminals are arranged on the straight line, generates first information for performing setting such that a transmission beam of any one of the base stations arranged on the straight line is stopped and another of the base stations non-orthogonally superimposes and multiplexes pieces of transmission data for the two respective user terminals with a predetermined power difference or power ratio; and controls the transmission beam of each of the two of the base stations arranged on the straight line on the basis of the first information.

公开(公告)号：US20240048500A1

公开(公告)日：2024-02-08

申请号：US18268693

申请日：2020-12-23

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Fumiaki NAGASE ,  Masafumi YOSHIOKA ,  Toshifumi MIYAGI

IPC: H04L47/32 ,  H04M7/00 ,  H04L43/0882 ,  H04L47/2416

CPC classification number: H04L47/32 ,  H04M7/0084 ,  H04L43/0882 ,  H04L47/2416

Abstract: An Internet Protocol (IP) phone system includes a traffic control device connected to a line. The traffic control device acquires a call duration of each of calls on one line shared by a plurality of IP phones, and sets a packet discard rate of each of the calls in a manner where the packet discard rate is proportional to the call duration until start of a new call so that total call traffic falls within a line capacity of the one line when the total call traffic exceeds the line capacity with the start of the new call.

公开(公告)号：US20250097851A1

公开(公告)日：2025-03-20

申请号：US18294197

申请日：2021-09-03

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Hayato FUKUZONO ,  Keita KURIYAMA ,  Masafumi YOSHIOKA ,  Toshifumi MIYAGI

IPC: H04W52/20 ,  H04W52/24 ,  H04W52/52

Abstract: A transmission device includes: a transmission signal amplifier enabled to vary transmission power; a transmission power control unit 28 that controls the transmission power; an error rate characteristic estimation unit that estimates an error rate of a reception signal in a reception device of a communication partner, and a reception unit that receives information on an SNR in the reception device. The error rate characteristic estimation unit executes: processing of estimating a constellation corresponding to a modulation scheme and reflecting a specification regarding an input-output characteristic of the transmission signal amplifier on the basis of the transmission power, and processing of estimating the error rate on the basis of a characteristic of the constellation and the SNR. The transmission power control unit controls the transmission power such that the error rate satisfies a predetermined requirement.

公开(公告)号：US20240364572A1

公开(公告)日：2024-10-31

申请号：US18683780

申请日：2021-08-19

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Hayato FUKUZONO ,  Keita KURIYAMA ,  Daisei UCHIDA ,  Masafumi YOSHIOKA ,  Toshifumi MIYAGI

IPC: H04L27/38

CPC classification number: H04L27/38

Abstract: Provided is a wireless communication system using a single-carrier multi-value modulation scheme, the wireless communication system aiming at preventing erroneous transmission of data and securing a high data rate while utilizing a non-linear region of an amplifier. A reception apparatus acquires, from a transmission apparatus, a specification related to an input/output characteristic of a transmission signal amplifier and transmission power of data transmission. On the basis of the specification and the transmission power, a constellation of signal points is estimated. A reception point, which is a point in constellation coordinates, of a reception signal is detected, and likelihood calculation for the reception point is performed with respect to the signal points. A symbol intended by the reception point is identified on the basis of a result of the likelihood calculation.

公开(公告)号：US20240275649A1

公开(公告)日：2024-08-15

申请号：US18681087

申请日：2021-09-03

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Hayato FUKUZONO ,  Keita KURIYAMA ,  Daisei UCHIDA ,  Masafumi YOSHIOKA ,  Toshifumi MIYAGI

IPC: H04L25/49 ,  H04L25/03 ,  H04L27/26

CPC classification number: H04L25/4917 ,  H04L25/03 ,  H04L27/26

Abstract: A wireless communication system according to an embodiment is a wireless communication system, in which a transmission device transmits the training signal to a reception device such that a plurality of signal points having different amplitudes on a constellation is included, and the reception device includes: an estimation unit that estimates the signal points included in the training signal of a case where it is assumed that, an input-output characteristic in a non-linear region of an amplifier is also linear; an equalization unit that performs initial equalization on a received signal; a correction unit that corrects a signal subjected to initial equalization by the equalization unit on the basis of the signal points estimated by the estimation unit; a likelihood calculation unit that calculates, with respect to a constellation before the amplifier amplifies a signal, a likelihood of a signal corrected by the correction unit.

公开(公告)号：US20230239905A1

公开(公告)日：2023-07-27

申请号：US18008874

申请日：2020-06-12

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Keita KURIYAMA ,  Hayato FUKUZONO ,  Masafumi YOSHIOKA ,  Takafumi HAYASHI

IPC: H04J3/00 ,  H04L5/14

CPC classification number: H04W72/54 ,  H04W72/0446 ,  H04L5/14

Abstract: In a wireless communication system in which propagation delays between a plurality of terminal station devices and a base station device, which use time division multiplexing in a duplex operation system, are different from each other, at least one of the base station device or the terminal station devices includes a delay calculating unit that calculates the propagation delay for each of the terminal station devices, and the base station device includes a control unit that changes a frame configuration such that a standby time required for switching between an uplink frame and a downlink frame is shortened in accordance with the propagation delay for each of the terminal station devices. In accordance with this, a surplus standby time can be shortened, and a transmission capacity can be improved.

公开(公告)号：US20220278721A1

公开(公告)日：2022-09-01

申请号：US17630227

申请日：2019-08-21

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Hayato FUKUZONO ,  Keita KURIYAMA ,  Masafumi YOSHIOKA ,  Tsutomu TATSUTA

IPC: H04B7/06 ,  H04B7/0452 ,  H04L27/26

Abstract: A transmission station device includes a training signal generation unit, a CP addition unit, and a transmission beamforming unit that performs transmission beamforming processing in a time domain using a transmission weight for removing inter-antenna interference. A reception station device includes a CP removal unit, a channel estimation unit, and an equalization unit that performs equalization processing for removing inter-symbol interference in a frequency domain using a reception weight. Either of the transmission station device or the reception station device is provided with a weight calculation unit that calculates the transmission weight and the reception weight based on the channel response, an effective CIR length calculation unit that calculates an effective CIR length between antennas, and a CP length setting unit that sets, to the CP length, a maximum CIR length among the CIR lengths of respective items of the reception weight.

公开(公告)号：US20210273705A1

公开(公告)日：2021-09-02

申请号：US17261148

申请日：2019-07-23

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Hayato FUKUZONO ,  Keita KURIYAMA ,  Toshio ITO ,  Shuta UENO ,  Masafumi YOSHIOKA ,  Tsutomu TATSUTA ,  Hiroyuki NAKAMURA

IPC: H04B7/06 ,  H04B7/0452

Abstract: A radio communication system includes a transmitting station, and at least one receiving apparatus. The transmitting station includes a plurality of modulation units configured to modulate a plurality of input data to generate first data signals in units of blocks having a predetermined data length, a subtraction unit configured to calculate, by using information acquired in advance and indicating a communication path response between the transmitting station and the receiving apparatus, information indicating directivity upon transmission of the first data signals of each of the plurality of modulation units, and predetermined information included in an additional signal to be added to a data signal, a delay wave component of the additional signal and subtract the delay wave component calculated, from each of the first data signals of the plurality of modulation units, to generate a plurality of second data signals, a beam forming unit configured to adjust, by using the information indicating directivity, power and a phase upon transmission of each of the plurality of second data signals to generate a plurality of third data signals, a plurality of adding units configured to add the additional signal to each of the plurality of third data signals to generate a plurality of fourth data signals, and a plurality of communication units configured to transmit the plurality of fourth data signals to the receiving apparatus.